Accumulating loop results in an array is bad for perf, but won't necessarily cause logic bugs.
My favourite implicit return gotcha comes from the intersection of CoffeeScript and jQuery, where implicitly returning `false` from an event handler implies `preventDefault()` and `stopPropagation()`. This can even cause heisenbugs if your logging throws booleans around.
My favourite implicit return gotcha comes from the intersection of CoffeeScript and jQuery, where implicitly returning `false` from an event handler implies `preventDefault()` and `stopPropagation()`. This can even cause heisenbugs if your logging throws booleans around.